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Moore Industries-International, Inc.
- 14 -
User’s Manual
225-748-01L
February 2017
Moore industries-International, Inc.
2. Power Input:
Connect the appropriate power source as shown in Figure 2.1.
3.
Set your input source to the low end of your configured input span. By example – if your
input is configured for a current (mA) and your input range is set for 4-20mA then use a
current source and set it to 4mA. Verify that the STA is reading 4mA on its display window.
4.
Set your input source to the high end of your configured input span and verify that the STA’s
display window correctly reflects the input.
5.
Set your input source to a value higher or lower than your configured input span and verify
that the Fault Relay changes state. The Fault Relay can be reset via the front panel push
buttons or via MR terminals (if configured).
6.
Temporarily remove one of your input connections to verify that the Broken Wire feature
is working. Note: the Fault Relay can be reset via the front panel push buttons or via MR
terminals (if configured).
7.
Alarm Relays:
By adjusting your input up and down you can confirm the operation of the Alarm Relays.
Use your multimeter (set to ohms) to verify the state of the relay contacts.
Units with the Analog Output option (-AO)
The STA’s analog output can be user configured one of three ways – 1) 0-20mA sourced with
voltage sourced by the STA (also referred to as Io Source) or 2) 0-20mA with voltage sourced by
the DCS (also referred to as Io Sink) or 3) 0-10V (also referred to as Vo).
Note that even though 0-20mA is the range of the analog output it can be scaled by the user for a
narrower range (such as 4-20mA). The same goes for the voltage output.
1.
Connect the analog output as per Figure 3.3. Use the terminals that are correct for your
application.
2. When testing the milliamp output it is best to use a 250 ohm precision resistor across the
output terminals (as shown in Figure 3.3). Then you can use your multimeter (set to voltage)
to read the voltage drop across the resistor. Hence a reading of 1V means that the analog
output is putting out 4mA, and a reading of 5V equates to a 20mA output. If using the STAs
voltage output terminals (+/-Vo) the voltage can be read directly with your multimeter.
3.
Set your input simulator to the low end of your configured input span. Verify that the analog
output is correct. By example – a 1V reading across your 250 ohm resistor equates to a
4mA output.
4.
Set your input simulator to the high end of your configured input span. Verify that the analog
output is correct. By example – a 5V reading across your 250 ohm resistor equates to a
20mA output.
You have now confirmed that your STA is operating correctly and can now be confidently
installed into your application.
Programmable Current/Voltage Safety Trip Alarm
STA
HLPRG
SEC
TION 2
